rcmd.c

   1 /*
   2  * Copyright (C) 1998 WIDE Project.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the project nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29 /*
  30  * Copyright (c) 1983, 1993, 1994
  31  *      The Regents of the University of California.  All rights reserved.
  32  *
  33  * Redistribution and use in source and binary forms, with or without
  34  * modification, are permitted provided that the following conditions
  35  * are met:
  36  * 1. Redistributions of source code must retain the above copyright
  37  *    notice, this list of conditions and the following disclaimer.
  38  * 2. Redistributions in binary form must reproduce the above copyright
  39  *    notice, this list of conditions and the following disclaimer in the
  40  *    documentation and/or other materials provided with the distribution.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58 #if 0
  59 static char sccsid[] = "@(#)rcmd.c      8.3 (Berkeley) 3/26/94";
  60 #endif /* LIBC_SCCS and not lint */
  61
  62 #define __UCLIBC_HIDE_DEPRECATED__
  63 #include <features.h>
  64 #include <sys/param.h>
  65 #include <sys/poll.h>
  66 #include <sys/socket.h>
  67 #include <sys/stat.h>
  68
  69 #include <netinet/in.h>
  70 #include <arpa/inet.h>
  71
  72 #include <signal.h>
  73 #include <fcntl.h>
  74 #include <netdb.h>
  75 #include <unistd.h>
  76 #include <pwd.h>
  77 #include <errno.h>
  78 #include <stdio.h>
  79 #include <stdio_ext.h>
  80 #include <ctype.h>
  81 #include <string.h>
  82 #include <libintl.h>
  83 #include <stdlib.h>
  84 #ifdef __UCLIBC_HAS_WCHAR__
  85 #include <wchar.h>
  86 #endif
  87 #include <sys/uio.h>
  88
  89
  90 /* some forward declarations */
  91 static int __ivaliduser2(FILE *hostf, u_int32_t raddr,
  92                          const char *luser, const char *ruser, const char *rhost);
  93 static int iruserok2 (u_int32_t raddr, int superuser, const char *ruser,
  94                       const char *luser, const char *rhost);
  95
  96
  97 int rcmd(char **ahost, u_short rport, const char *locuser, const char *remuser,
  98                  const char *cmd, int *fd2p)
  99 {
 100 #ifdef __UCLIBC_HAS_REENTRANT_RPC__
 101         int herr;
 102         struct hostent hostbuf;
 103         size_t hstbuflen;
 104         char *tmphstbuf;
 105 #endif
 106         struct hostent *hp;
 107         struct sockaddr_in sin, from;
 108         struct pollfd pfd[2];
 109         int32_t oldmask;
 110         pid_t pid;
 111         int s, lport, timo;
 112         char c;
 113
 114         pid = getpid();
 115
 116 #ifdef __UCLIBC_HAS_REENTRANT_RPC__
 117         hstbuflen = 1024;
 118         tmphstbuf = stack_heap_alloc(hstbuflen);
 119
 120         while (gethostbyname_r (*ahost, &hostbuf, tmphstbuf,
 121                     hstbuflen, &hp, &herr) != 0 || hp == NULL)
 122         {
 123             if (herr != NETDB_INTERNAL || errno != ERANGE)
 124             {
 125                 __set_h_errno (herr);
 126                 stack_heap_free(tmphstbuf);
 127                 herror(*ahost);
 128                 return -1;
 129             }
 130             else
 131             {
 132                 /* Enlarge the buffer.  */
 133                 hstbuflen *= 2;
 134                 stack_heap_free(tmphstbuf);
 135                 tmphstbuf = stack_heap_alloc(hstbuflen);
 136             }
 137         }
 138         stack_heap_free(tmphstbuf);
 139 #else /* call the non-reentrant version */
 140         if ((hp = gethostbyname(*ahost)) == NULL) {
 141             return -1;
 142         }
 143 #endif
 144         pfd[0].events = POLLIN;
 145         pfd[1].events = POLLIN;
 146
 147         *ahost = hp->h_name;
 148         oldmask = sigblock(sigmask(SIGURG)); /* __sigblock */
 149         for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
 150                 s = rresvport(&lport);
 151                 if (s < 0) {
 152                         if (errno == EAGAIN)
 153                             (void)fprintf(stderr,
 154                                           "rcmd: socket: All ports in use\n");
 155                         else
 156                             (void)fprintf(stderr, "rcmd: socket: %m\n");
 157                         sigsetmask(oldmask); /* sigsetmask */
 158                         return -1;
 159                 }
 160                 fcntl(s, F_SETOWN, pid);
 161                 sin.sin_family = hp->h_addrtype;
 162                 memmove(&sin.sin_addr, hp->h_addr_list[0],
 163                       MIN (sizeof (sin.sin_addr), hp->h_length));
 164                 sin.sin_port = rport;
 165                 if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0) /* __connect */
 166                         break;
 167                 (void)close(s);
 168                 if (errno == EADDRINUSE) {
 169                         lport--;
 170                         continue;
 171                 }
 172                 if (errno == ECONNREFUSED && timo <= 16) {
 173                         (void)sleep(timo); /* __sleep */
 174                         timo *= 2;
 175                         continue;
 176                 }
 177                 if (hp->h_addr_list[1] != NULL) {
 178                         int oerrno = errno;
 179
 180                         (void)fprintf(stderr, "connect to address %s: ",
 181                             inet_ntoa(sin.sin_addr));
 182                         __set_errno (oerrno);
 183                         perror(0);
 184                         hp->h_addr_list++;
 185                         memmove(&sin.sin_addr, hp->h_addr_list[0],
 186                               MIN (sizeof (sin.sin_addr), hp->h_length));
 187                         (void)fprintf(stderr, "Trying %s...\n",
 188                             inet_ntoa(sin.sin_addr));
 189                         continue;
 190                 }
 191                 (void)fprintf(stderr, "%s: %m\n", hp->h_name);
 192                 sigsetmask(oldmask); /* __sigsetmask */
 193                 return -1;
 194         }
 195         lport--;
 196         if (fd2p == 0) {
 197                 write(s, "", 1);
 198                 lport = 0;
 199         } else {
 200                 char num[8];
 201                 int s2 = rresvport(&lport), s3;
 202                 socklen_t len = sizeof(from);
 203
 204                 if (s2 < 0)
 205                         goto bad;
 206                 listen(s2, 1);
 207                 (void)snprintf(num, sizeof(num), "%d", lport); /* __snprintf */
 208                 if (write(s, num, strlen(num)+1) != strlen(num)+1) {
 209                         (void)fprintf(stderr,
 210                                       "rcmd: write (setting up stderr): %m\n");
 211                         (void)close(s2);
 212                         goto bad;
 213                 }
 214                 pfd[0].fd = s;
 215                 pfd[1].fd = s2;
 216                 __set_errno (0);
 217                 if (poll (pfd, 2, -1) < 1 || (pfd[1].revents & POLLIN) == 0){
 218                     if (errno != 0)
 219                         (void)fprintf(stderr, "rcmd: poll (setting up stderr): %m\n");
 220                     else
 221                         (void)fprintf(stderr, "poll: protocol failure in circuit setup\n");
 222                         (void)close(s2);
 223                         goto bad;
 224                 }
 225                 s3 = accept(s2, (struct sockaddr *)&from, &len);
 226                 (void)close(s2);
 227                 if (s3 < 0) {
 228                         (void)fprintf(stderr,
 229                             "rcmd: accept: %m\n");
 230                         lport = 0;
 231                         goto bad;
 232                 }
 233                 *fd2p = s3;
 234                 from.sin_port = ntohs((u_short)from.sin_port);
 235                 if (from.sin_family != AF_INET ||
 236                     from.sin_port >= IPPORT_RESERVED ||
 237                     from.sin_port < IPPORT_RESERVED / 2) {
 238                         (void)fprintf(stderr,
 239                             "socket: protocol failure in circuit setup\n");
 240                         goto bad2;
 241                 }
 242         }
 243         (void)write(s, locuser, strlen(locuser)+1);
 244         (void)write(s, remuser, strlen(remuser)+1);
 245         (void)write(s, cmd, strlen(cmd)+1);
 246         if (read(s, &c, 1) != 1) {
 247                 (void)fprintf(stderr,
 248                     "rcmd: %s: %m\n", *ahost);
 249                 goto bad2;
 250         }
 251         if (c != 0) {
 252                 while (read(s, &c, 1) == 1) {
 253                         (void)write(STDERR_FILENO, &c, 1);
 254                         if (c == '\n')
 255                                 break;
 256                 }
 257                 goto bad2;
 258         }
 259         sigsetmask(oldmask);
 260         return s;
 261 bad2:
 262         if (lport)
 263                 (void)close(*fd2p);
 264 bad:
 265         (void)close(s);
 266         sigsetmask(oldmask);
 267         return -1;
 268 }
 269
 270 int rresvport(int *alport)
 271 {
 272     struct sockaddr_in sin;
 273     int s;
 274
 275     sin.sin_family = AF_INET;
 276     sin.sin_addr.s_addr = INADDR_ANY;
 277     s = socket(AF_INET, SOCK_STREAM, 0);
 278     if (s < 0)
 279         return -1;
 280     for (;;) {
 281         sin.sin_port = htons((u_short)*alport);
 282         if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
 283             return s;
 284         if (errno != EADDRINUSE) {
 285             (void)close(s);
 286             return -1;
 287         }
 288         (*alport)--;
 289         if (*alport == IPPORT_RESERVED/2) {
 290             (void)close(s);
 291             __set_errno (EAGAIN);               /* close */
 292             return -1;
 293         }
 294     }
 295
 296     return -1;
 297 }
 298 libc_hidden_def(rresvport)
 299
 300 /* This needs to be exported ... while it is not a documented interface
 301  * for rcp related apps, it's a required one that is used to control the
 302  * rhost behavior.  Legacy sucks.
 303  */
 304 int  __check_rhosts_file = 1;
 305
 306 int ruserok(const char *rhost, int superuser, const char *ruser,
 307                         const char *luser)
 308 {
 309         struct hostent *hp;
 310         u_int32_t addr;
 311         char **ap;
 312 #ifdef __UCLIBC_HAS_REENTRANT_RPC__
 313         size_t buflen;
 314         char *buffer;
 315         int herr;
 316         struct hostent hostbuf;
 317 #endif
 318
 319 #ifdef __UCLIBC_HAS_REENTRANT_RPC__
 320         buflen = 1024;
 321         buffer = stack_heap_alloc(buflen);
 322
 323         while (gethostbyname_r (rhost, &hostbuf, buffer,
 324                     buflen, &hp, &herr) != 0 || hp == NULL)
 325         {
 326             if (herr != NETDB_INTERNAL || errno != ERANGE) {
 327                 stack_heap_free(buffer);
 328                 return -1;
 329             } else
 330             {
 331                 /* Enlarge the buffer.  */
 332                 buflen *= 2;
 333                 stack_heap_free(buffer);
 334                 buffer = stack_heap_alloc(buflen);
 335             }
 336         }
 337         stack_heap_free(buffer);
 338 #else
 339         if ((hp = gethostbyname(rhost)) == NULL) {
 340                 return -1;
 341         }
 342 #endif
 343         for (ap = hp->h_addr_list; *ap; ++ap) {
 344                 memmove(&addr, *ap, sizeof(addr));
 345                 if (iruserok2(addr, superuser, ruser, luser, rhost) == 0)
 346                         return 0;
 347         }
 348         return -1;
 349 }
 350
 351
 352 /* Extremely paranoid file open function. */
 353 static FILE *
 354 iruserfopen (const char *file, uid_t okuser)
 355 {
 356   struct stat st;
 357   char *cp = NULL;
 358   FILE *res = NULL;
 359
 360   /* If not a regular file, if owned by someone other than user or
 361      root, if writeable by anyone but the owner, or if hardlinked
 362      anywhere, quit.  */
 363   if (lstat (file, &st))
 364     cp = "lstat failed";
 365   else if (!S_ISREG (st.st_mode))
 366     cp = "not regular file";
 367   else
 368     {
 369       res = fopen (file, "r");
 370       if (!res)
 371         cp = "cannot open";
 372       else if (fstat (fileno (res), &st) < 0)
 373         cp = "fstat failed";
 374       else if (st.st_uid && st.st_uid != okuser)
 375         cp = "bad owner";
 376       else if (st.st_mode & (S_IWGRP|S_IWOTH))
 377         cp = "writeable by other than owner";
 378       else if (st.st_nlink > 1)
 379         cp = "hard linked somewhere";
 380     }
 381
 382   /* If there were any problems, quit.  */
 383   if (cp != NULL)
 384     {
 385       if (res)
 386         fclose (res);
 387       return NULL;
 388     }
 389
 390   return res;
 391 }
 392
 393
 394 /*
 395  * New .rhosts strategy: We are passed an ip address. We spin through
 396  * hosts.equiv and .rhosts looking for a match. When the .rhosts only
 397  * has ip addresses, we don't have to trust a nameserver.  When it
 398  * contains hostnames, we spin through the list of addresses the nameserver
 399  * gives us and look for a match.
 400  *
 401  * Returns 0 if ok, -1 if not ok.
 402  */
 403 static int
 404 iruserok2 (u_int32_t raddr, int superuser, const char *ruser, const char *luser,
 405                    const char *rhost)
 406 {
 407         FILE *hostf = NULL;
 408         int isbad = -1;
 409
 410         if (!superuser)
 411                 hostf = iruserfopen (_PATH_HEQUIV, 0);
 412
 413         if (hostf) {
 414                 isbad = __ivaliduser2 (hostf, raddr, luser, ruser, rhost);
 415                 fclose (hostf);
 416
 417                 if (!isbad)
 418                         return 0;
 419         }
 420
 421         if (__check_rhosts_file || superuser) {
 422                 char *pbuf;
 423                 struct passwd *pwd;
 424                 size_t dirlen;
 425                 uid_t uid;
 426
 427 #ifdef __UCLIBC_HAS_REENTRANT_RPC__
 428                 size_t buflen = sysconf (_SC_GETPW_R_SIZE_MAX);
 429                 struct passwd pwdbuf;
 430                 char *buffer = stack_heap_alloc(buflen);
 431
 432                 if (getpwnam_r (luser, &pwdbuf, buffer,
 433                             buflen, &pwd) != 0 || pwd == NULL)
 434                 {
 435                         stack_heap_free(buffer);
 436                         return -1;
 437                 }
 438                 stack_heap_free(buffer);
 439 #else
 440                 if ((pwd = getpwnam(luser)) == NULL)
 441                         return -1;
 442 #endif
 443
 444                 dirlen = strlen (pwd->pw_dir);
 445                 pbuf = malloc (dirlen + sizeof "/.rhosts");
 446                 strcpy (pbuf, pwd->pw_dir);
 447                 strcat (pbuf, "/.rhosts");
 448
 449                 /* Change effective uid while reading .rhosts.  If root and
 450                    reading an NFS mounted file system, can't read files that
 451                    are protected read/write owner only.  */
 452                 uid = geteuid ();
 453                 seteuid (pwd->pw_uid);
 454                 hostf = iruserfopen (pbuf, pwd->pw_uid);
 455                 free(pbuf);
 456
 457                 if (hostf != NULL) {
 458                         isbad = __ivaliduser2 (hostf, raddr, luser, ruser, rhost);
 459                         fclose (hostf);
 460                 }
 461
 462                 seteuid (uid);
 463                 return isbad;
 464         }
 465         return -1;
 466 }
 467
 468 /* This is the exported version.  */
 469 int iruserok (u_int32_t raddr, int superuser, const char * ruser, const char * luser);
 470 int iruserok (u_int32_t raddr, int superuser, const char * ruser, const char * luser)
 471 {
 472         return iruserok2 (raddr, superuser, ruser, luser, "-");
 473 }
 474
 475
 476 /*
 477  * XXX
 478  * Don't make static, used by lpd(8).
 479  *
 480  * This function is not used anymore. It is only present because lpd(8)
 481  * calls it (!?!). We simply call __invaliduser2() with an illegal rhost
 482  * argument. This means that netgroups won't work in .rhost/hosts.equiv
 483  * files. If you want lpd to work with netgroups, fix lpd to use ruserok()
 484  * or PAM.
 485  * Returns 0 if ok, -1 if not ok.
 486  */
 487 int
 488 __ivaliduser(FILE *hostf, u_int32_t raddr, const char *luser, const char *ruser);
 489 int
 490 __ivaliduser(FILE *hostf, u_int32_t raddr, const char *luser, const char *ruser)
 491 {
 492         return __ivaliduser2(hostf, raddr, luser, ruser, "-");
 493 }
 494
 495
 496 /* Returns 1 on positive match, 0 on no match, -1 on negative match.  */
 497 static int
 498 __icheckhost (u_int32_t raddr, char *lhost, const char *rhost)
 499 {
 500         struct hostent *hp;
 501         u_int32_t laddr;
 502         int negate=1;    /* Multiply return with this to get -1 instead of 1 */
 503         char **pp;
 504
 505 #ifdef __UCLIBC_HAS_REENTRANT_RPC__
 506         int save_errno;
 507         size_t buflen;
 508         char *buffer;
 509         struct hostent hostbuf;
 510         int herr;
 511 #endif
 512
 513 #ifdef HAVE_NETGROUP
 514         /* Check nis netgroup.  */
 515         if (strncmp ("+@", lhost, 2) == 0)
 516                 return innetgr (&lhost[2], rhost, NULL, NULL);
 517
 518         if (strncmp ("-@", lhost, 2) == 0)
 519                 return -innetgr (&lhost[2], rhost, NULL, NULL);
 520 #endif /* HAVE_NETGROUP */
 521
 522         /* -host */
 523         if (strncmp ("-", lhost,1) == 0) {
 524                 negate = -1;
 525                 lhost++;
 526         } else if (strcmp ("+",lhost) == 0) {
 527                 return 1;                    /* asking for trouble, but ok.. */
 528         }
 529
 530         /* Try for raw ip address first. */
 531         if (isdigit (*lhost) && (laddr = inet_addr (lhost)) != INADDR_NONE)
 532                 return negate * (! (raddr ^ laddr));
 533
 534         /* Better be a hostname. */
 535 #ifdef __UCLIBC_HAS_REENTRANT_RPC__
 536         buflen = 1024;
 537         buffer = malloc(buflen);
 538         save_errno = errno;
 539
 540         while (gethostbyname_r (lhost, &hostbuf, buffer, buflen, &hp, &herr)
 541                != 0) {
 542             free(buffer);
 543             return (0);
 544         }
 545         free(buffer);
 546         __set_errno (save_errno);
 547 #else
 548         hp = gethostbyname(lhost);
 549 #endif /* __UCLIBC_HAS_REENTRANT_RPC__ */
 550
 551         if (hp == NULL)
 552                 return 0;
 553
 554         /* Spin through ip addresses. */
 555         for (pp = hp->h_addr_list; *pp; ++pp)
 556                 if (!memcmp (&raddr, *pp, sizeof (u_int32_t)))
 557                         return negate;
 558
 559         /* No match. */
 560         return (0);
 561 }
 562
 563 /* Returns 1 on positive match, 0 on no match, -1 on negative match.  */
 564 static int
 565 __icheckuser (const char *luser, const char *ruser)
 566 {
 567
 568     /*
 569       luser is user entry from .rhosts/hosts.equiv file
 570       ruser is user id on remote host
 571       */
 572
 573 #ifdef HAVE_NETGROUP
 574     /* [-+]@netgroup */
 575     if (strncmp ("+@", luser, 2) == 0)
 576         return innetgr (&luser[2], NULL, ruser, NULL);
 577
 578     if (strncmp ("-@", luser,2) == 0)
 579         return -innetgr (&luser[2], NULL, ruser, NULL);
 580 #endif /* HAVE_NETGROUP */
 581
 582     /* -user */
 583     if (strncmp ("-", luser, 1) == 0)
 584         return -(strcmp (&luser[1], ruser) == 0);
 585
 586     /* + */
 587     if (strcmp ("+", luser) == 0)
 588         return 1;
 589
 590     /* simple string match */
 591     return strcmp (ruser, luser) == 0;
 592 }
 593
 594 /*
 595  * Returns 1 for blank lines (or only comment lines) and 0 otherwise
 596  */
 597 static int
 598 __isempty(char *p)
 599 {
 600     while (*p && isspace (*p)) {
 601         ++p;
 602     }
 603
 604     return (*p == '\0' || *p == '#') ? 1 : 0 ;
 605 }
 606
 607 /*
 608  * Returns 0 if positive match, -1 if _not_ ok.
 609  */
 610 static int
 611 __ivaliduser2(FILE *hostf, u_int32_t raddr,     const char *luser,
 612                           const char *ruser, const char *rhost)
 613 {
 614     register const char *user;
 615     register char *p;
 616     int hcheck, ucheck;
 617     char *buf = NULL;
 618     size_t bufsize = 0;
 619     int retval = -1;
 620
 621     while (getline (&buf, &bufsize, hostf) > 0) {
 622         buf[bufsize - 1] = '\0'; /* Make sure it's terminated.  */
 623         p = buf;
 624
 625         /* Skip empty or comment lines */
 626         if (__isempty (p)) {
 627             continue;
 628         }
 629
 630         /* Skip lines that are too long. */
 631         if (strchr (p, '\n') == NULL) {
 632             int ch = getc_unlocked (hostf);
 633
 634             while (ch != '\n' && ch != EOF)
 635               ch = getc_unlocked (hostf);
 636             continue;
 637         }
 638
 639         for (;*p && !isspace(*p); ++p) {
 640             *p = tolower (*p);
 641         }
 642
 643         /* Next we want to find the permitted name for the remote user.  */
 644         if (*p == ' ' || *p == '\t') {
 645             /* <nul> terminate hostname and skip spaces */
 646             for (*p++='\0'; *p && isspace (*p); ++p);
 647
 648             user = p;                   /* this is the user's name */
 649             while (*p && !isspace (*p))
 650                 ++p;                    /* find end of user's name */
 651         } else
 652             user = p;
 653
 654         *p = '\0';              /* <nul> terminate username (+host?) */
 655
 656         /* buf -> host(?) ; user -> username(?) */
 657
 658         /* First check host part */
 659         hcheck = __icheckhost (raddr, buf, rhost);
 660
 661         if (hcheck < 0)
 662             break;
 663
 664         if (hcheck) {
 665             /* Then check user part */
 666             if (! (*user))
 667                 user = luser;
 668
 669             ucheck = __icheckuser (user, ruser);
 670
 671             /* Positive 'host user' match? */
 672             if (ucheck > 0) {
 673                 retval = 0;
 674                 break;
 675             }
 676
 677             /* Negative 'host -user' match? */
 678             if (ucheck < 0)
 679                 break;
 680
 681             /* Neither, go on looking for match */
 682         }
 683     }
 684
 685     free (buf);
 686
 687     return retval;
 688 }